Question

Tìm số abc biết abc x 9 = 3abc

Answer 1

abc x 9=3abc

=>abc x 9=3000+abc

=>abc x 9-abc=3000

=>8 x abc=3000

=>abc=375

Vậy abc=375

Answer 2

abc*9=3abc

(100a+10b+c)*9=3000+100a+10b+c

900a+90b+9c=3000+100a+10b+c

(900a-100)a+(90b-10b)+(9c-c)=3000

800a+80b+8c=3000

8(100a+10b+c)=3000

8*abc=3000

abc=3000/8=375

nên abc=375

Vậy abc=375

Answer 3

abc x 9=3abc

=>abc x 9=3000+abc

=>abc x 9-abc=3000

=>8 x abc=3000

=>abc=375

Vậy abc=375

Answer 4

sao lai la 3000

Answer 5

abc x 9 = 3abc

abc x 9 = 3000 x abc

abc x 9 - abc = 3000

abc x 8 = 3000

abc 3000 : 8 = 375

Vậy abc = 375